Carbureter.



R. M. ANDERSON.

CARBURETER.

APPLICATION FILED MAY 21, 1912.

' Patented'Apr. 18,1916.

Wit/26 866$:

gmi w A UNITED STATES PATENT orsro.

RAYMOND M. ANDERSON, OF CHICAGO, ILLI-bTOIS, ASSIGNOB' TO STROMBI ERG MOTOR- DEVICES COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CARBUBETER.

Specification of Letters Patent. Patented AE $1318, 1916.

Application filed May 27, 191.2. SrialNo. 699,864.

1 0 all whom it may concern Be it known that I, RAYMOND M. ANDER- SON, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Carbureters, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My'invention relates to carbureters for use in association with internal combustion engines and it is concerned with improved means for regulating the fuel supply in order that the proper proportion between the fuel and the air is maintained under the diflerent running conditions.

My carbureter is of that type in which a constant level is maintained by the use of an auxiliary chamber, such as a float chamber, and it is my idea to vary the pressure I on the top of the liquid fuel, such as gasolene, in the float chamber by means of an arrangement responding to the suction of the engine with which the carbureter is associated. It is toward the means for varying the pressure on the top of the fuel in the float chamber that my invention rected. The chamber above the fuel in the float chamber is connected by means of a passageway with the carburetlng chambern so that it is subject to the pressure therein.

.This passageway, however, is controlled by means of a valve, and the extent to" which the pressure in the carbureting chamber 1s effective in the float chamber is determined by the position of this valve. Furthermore,

viewing my invention in this more specific aspect, this valve is operated with a secondary or auxiliary air valve'and, in the par tlcular form herein shown and descrlbed,

this air Valve is carried with a special piston which is arranged to be subject to the pressure in the carbureting chamber. The

piston and auxiliary valve arrangement is easily operative and is substantially the same as that--shown in the co-pending application of John S. Goldberg, Serial No. 699,838, filed May 27, 1912. The movement of the auxiliary air valve is imparted to the valve controlling a passageway to the top of the float chamber and it will be seen that at the various speeds there will be correspondingvariations in the supply of fuel, these varlations being accompanied by pointed out.

My invention is illustrated in the accompanying drawing whichis a view partly in' elevation and partly in longitudinal axial section.

The casing is illustrated at 5 and it will be seen that it rovides the carbureting chamber 6 to which the primary air passage in the form of a Venturi tube 7 leads. The outlet for the carbureting chamber 6 is controlled by a throttle valve 8 and is surrounded by a flange 9 .by means of which the device may be secured to the manifold of the engine. The primary air inlet passageway 8' connects with the lower end of Y the Venturi tube and this air inlet is sup.-

plemented by an air horn 9 which is setending outside the horn and provided there with an operating lever 15. A spring pressed plunger 16, which is adapted to rest in grooves in the periphery of the hub of' the operating lever holds the valve 13 in either its open or closed position. The air horn 9 may be connected with a warm air inlet and the warm .air going'inin this way.

may be dil-uted by cold air entering through the side passages 17 which are controlled by an annular valve 18; v

The bridge 12 is in the form of a tube and-forms 'a fuel passageway. The fuel used isin liquid form, such as gasolene, and

it is introduced into the carbureter through a float chamber .19. The float chamber is provided with an entry coupling 20 which is connected with the source of fuel supply.

The float chamber is provided with a float 20 which, through the. medium of levers 19', operates a valve 18" controlling the gasolene inlet passageway 17 A fuel emit ting nozzle21 is supported on the top of the bridge 12 and is located axially in the Venturi' tube, ending in substantially the most contracted portion thereof. The Venturi ggbe may be surrounded by a" water jacket At one side of the carbureting chamber 6 there is provided the auxiliary supply cham ber 23 into which a' passageway 24 leads. This passageway is connected, by means of Below the auxiliary supply chamber 23,

' there is a valve chamber 26 and below the valve chamber there is a piston chamber 27. A piston 28 is mounted to reciprocatevertically in the chamber 27 and it carries a tubular shaft 29 which extends upwardly and which is provided with a reduced portion 30 mounted to reciprocate in a boss 31 in the upper wall of the chamber 23. A spring 32 is disposed inside the tubular shaft 29' and between a shoulder 33 therein andthe base of the piston chamber 27. The bore of the shaft 29 is exposed to the auxiliary-supply chamber 23 and.thus to the carbureting chamber 6 through the side opening 34 and it'will be seen that the pressure is accessible to the underside of the piston 28 in this way.

- The upper side of' the piston is open to atmosphere. An annular valve 35 is disposed in the valve chamber 26 and is held in place, so that it may be given angular movement, by means of. the plate 36. This valve has a central opening for the passage of the shaft 29 and is in the form of a ring in which the automatic valve 37, secured to the shaft 29, may operate.

The valve casing 26 is provided with one or more side inlets 38, 38, indicated in dotted lines, and the valve 35 is provided with one or more openings 39. When the valve 35 is in the position shown in the drawing, the openings 38 are closed, but it Will be seen that the valve may be given angular movement to give the openings any desired 'efiective s1ze. I

The normal position of the valve 37 is its uppermost position, as shown in the draw ing, and in this position it cuts off the auxiliary supplyv chamber from the atmosphere openings 38.. When the suction created in the carbureting chamber has reacheda predetermined point, however, it overcomes the tension of the spring 32 and, playing on the under surface of the iston 28, draws the piston down and with it the valve 37 so that more or less of the openings 38 may be brought into operativeconnection with the auxiliary supply chamber.

Mounted in an opening in the top of the auxiliary supply chamber. 23 is a bushing 43 and a lever 44 is mounted upon a pivot "45 carried by this bushing. The end of this lever is bifurcated at 46 so that it may embrace a collar 47 adjustably screw-threaded upon the end of the rod 30. This sleeve may be held in anyadjusted position by means of spring pressed balls 48, 48 which rest in peripheral grooves in the rod. The lever 44 engages with the valve carrier 49 which extends into the-chamber 23 and is there provided with a needle valve 50 disposed in axial alinement with an outlet in the pas- ,sageway 24 so that 'it may enter said outlet and so that its vertical movement will determine the effective area of said outlet.

The needle valve 50 is more or less loosely mounted, under the tension of the spring 51,

so that it may seat itself properly at the proper time.

The'top of the float chamber 19 is connected with the atmosphere through a restricted opening 52. When the passageway 24 is in open communication with the pressure in the carbureting chamber 6, any suction in the carbureting chamber will subtractfrom the effect of the atmosphere on the surface of, the fuel in the 'float chamber. And the amount subtracted in this way may be regulated. by positioning the valve 50. The taper of this valve is such that the proper variation in the subtracting effect is had in order that a leaner mixture may be obtained for the higher speeds. WVhen the automatic auxiliary air valve is closed, 'the passageway 24 is restricted only to such an extent that the atmosphere may move only the proper amount of fuel for low speeds throughthe nozzle 21. As the suction of the engine increases, however, the auxiliary air valve 37 is drawn down to admit more air and the valve 50 is also drawn down so that the subtracting effect of the suction of the carbureting. chamber 6 will be cut OH to a considerable extent. This allows the atmosphere to play morefreely and more fuel is moved through the nozzle 21. The proper amount of auxiliary air may be adjusted inthe first place by manipulating the manual valve and thereafter the proper relative amount thereof will be determined by the position of the automatic valve.

I claim as new and desire to secure by Letters Patent:

1. In a carbureter, a carbureting chamber, a fuel inlet nozzle therefor, an air inlet therefor, a fuel reservoir connected with said fuel inlet, a restricted air supply to said reservoir, a passageway leading from the top of the reservoir to the carbureting chamber, an auxiliary air inlet, a valve responsive to the pressure in said carbureting chamber controlling said auxiliary air in-.

- gme for moving said valve.

bureting chamber with the top of said-float chamber, a secondary air inlet, an automatic valve for said secondary inlet, and means operated with said secondary air inlet valve for varying the size of said passageway.

3. In a ca'rbureter, a carbureting chamber, a fuel inlet nozzle therefor, an air inlet therefor, a fuel reservoir connected with said fuel inlet, a passageway leading from the top of the reservoir to the carbureting chamber, an auxiliary air inlet, a valve con- 7 trolling said auxiliary air inlet, a valve controlling said passageway and mechanically connected with said auxiliary air valve, and a piston responsive to the suction of the'en- 4. In a carbureter, a carburetin chamber, a valve chamber with an air in ct associated therewith, a piston chamber, a piston in said piston chamber, an air valve in said valve chamber, a manually operated valve controlling said air inlet, a fuel inlet, a reservoir supplying said fuel inlet, a passage between said reservoir over the liquid level and said carbureting chamber, a valve in said passage, and mechanicalconnection between said last-named valve, said air valve and said piston.

5. In a carburetor, a carbureting chamber, primary air and fuel inlet means, a throttle valve controlling the outlet, a float chamber connected with said nozzle, a passage between the top of said afloat chamber and said carbureting' ehamber ,'-.a vertical cylindrical valve chamber with side inlets, a

t'ubular'valve withinsaid valve chamber operated manually to vary the efiective size of said side outlets, a pistonvalve in said.

tubular valve, a piston chamber below said valve chamber, a piston in said piston chamber, a hollow shaft connecting said pistons,

said hollow shaft passing through the carbureter chamber and having its bore exemg thus exposed toithe pressure in the carbureting chamber and the other side of the pistonbeing exposed to the atmosphere,

said hollow shaft extending beyond the easing, a loosely mounted needle valve for the passage, a carrier for said valve, and a lever posed thereto, thegundersideof the piston to said carrier and adapted to be en 

